Input/Output Formats Default to YAML (#793)

Author: maddenp-cu

docs/sections/user_guide/cli/tools/config/compare-bad-extension.out

@@ -1 +1 @@
-Cannot deduce format of 'a.txt' from unknown extension 'txt'
+[2025-01-02T03:04:05]    ERROR Formats do not match: yaml vs nml

docs/sections/user_guide/cli/tools/config/realize-extension-file-bad.out

@@ -1 +1,7 @@
-Cannot deduce format of 'config.txt' from unknown extension 'txt'
+values:
+  date: 20240105
+  empty: null
+  greeting: Good Night
+  message: Good Night Moon Good Night Moon
+  recipient: Moon
+  repeat: 2

docs/sections/user_guide/cli/tools/config/realize-extension-stdin-bad.out

@@ -1 +1,7 @@
-Specify --input-format when --input-file is not specified
+values:
+  date: 20240105
+  empty: null
+  greeting: Good Night
+  message: Good Night Moon Good Night Moon
+  recipient: Moon
+  repeat: 2

docs/sections/user_guide/cli/tools/template/render-exec-bad-extension.out

@@ -1 +1 @@
-Cannot deduce format of 'values.txt' from unknown extension 'txt'
+Hello, World!